Obesity in children can lead to hypertension, and the most common cause of hypertension in children is actually obesity. Many parents of children seen in outpatient clinics do not accept the reality of this obesity, so that the child to measure a blood pressure, the results found that most of the children are combined with hypertension. The specific cause of hypertension in children with obesity is the change in cardiac structure and cardiac blood flow dynamics caused by fat in obese children. Excess fat accumulation leads to an increase in cardiac blood volume and cardiac output, which in turn leads to an increase in blood pressure. Hypertension is usually a disease of adults or older people. If a child develops high blood pressure at the age of seven, eight or ten, it will have a huge impact on the child’s health in the long term, especially after ten or twenty years when the blood pressure will be very difficult to control, so it is important to actively control the child’s blood pressure by losing weight.